标题: Prep语法题一道 [打印本页] 作者: coffeeqoo 时间: 2012-4-3 14:03 标题: Prep语法题一道 In some species of cricket, the number of chirps per minute used by the male for attracting females rise and fall in accordance with the surrounding temperature, and they can in fact serve as an approximate thermometer.
(A) for attracting females rise and fall in accordance with the surrounding temperature, and they can in fact serve (B) for attracting females rises and falls in accordance with the surrounding temperature, which can in fact serve (C) in attracting females rise and fall in accordance with the surrounding temperature, in fact possibly serving (D) to attract females rises and falls in accordance with the surrounding temperature, and it can in fact serve (E) to attract females rises and falls in accordance with the surrounding temperature, in fact possibly serving 答案是D，但想问一下D中and后的代词it指代什么？作者: wangmy820 时间: 2012-4-3 14:59
应该指代的是the number of chirps per minute